/*
 * Copyright (C) 2010 ZXing authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.zxing.client.android.result.supplement;

import android.content.Context;
import android.text.Html;
import android.widget.TextView;
import com.google.zxing.client.android.HttpHelper;
import com.google.zxing.client.android.R;
import com.google.zxing.client.android.history.HistoryManager;
import com.google.zxing.client.android.LocaleManager;

import java.io.IOException;
import java.net.URLEncoder;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * <p>
 * Retrieves product information from Google Product search.
 * </p>
 *
 * <p>
 * <strong>Please do not reuse this code.</strong> Using results in this way
 * requires permission from Google, and that is not granted to users via this
 * project.
 * </p>
 *
 * @author Sean Owen
 */
final class ProductResultInfoRetriever extends SupplementalInfoRetriever {

	private static final Pattern[] PRODUCT_NAME_PRICE_PATTERNS = {
			Pattern.compile(",event\\)\">([^<]+)</a></h3>.+<span class=psrp>([^<]+)</span>"),
			Pattern.compile("owb63p\">([^<]+).+zdi3pb\">([^<]+)"), };

	private final String productID;
	private final String source;
	private final Context context;

	ProductResultInfoRetriever(TextView textView, String productID, HistoryManager historyManager, Context context) {
		super(textView, historyManager);
		this.productID = productID;
		this.source = context.getString(R.string.msg_google_product);
		this.context = context;
	}

	@Override
	void retrieveSupplementalInfo() throws IOException {

		String encodedProductID = URLEncoder.encode(productID, "UTF-8");
		String uri = "https://www.google." + LocaleManager.getProductSearchCountryTLD(context)
				+ "/m/products?ie=utf8&oe=utf8&scoring=p&source=zxing&q=" + encodedProductID;
		CharSequence content = HttpHelper.downloadViaHttp(uri, HttpHelper.ContentType.HTML);

		for (Pattern p : PRODUCT_NAME_PRICE_PATTERNS) {
			Matcher matcher = p.matcher(content);
			if (matcher.find()) {
				append(productID, source,
						new String[] { unescapeHTML(matcher.group(1)), unescapeHTML(matcher.group(2)) }, uri);
				break;
			}
		}
	}

	private static String unescapeHTML(String raw) {
		return Html.fromHtml(raw).toString();
	}

}
